Pipe vent

Details Pipe vent Pipe vent

1976-05-26

1977-08-09

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2301

Patent

active

D02453339

REFERENCES:
patent: D179739 (1957-02-01), McClelland
patent: D211875 (1968-08-01), Porter
patent: D223358 (1972-04-01), Porter
patent: 1719932 (1929-07-01), Holtson
patent: 1868730 (1932-07-01), Dowrio
patent: 2601820 (1952-07-01), Paul et al.
patent: 2825276 (1958-03-01), Porter
patent: 3469520 (1969-09-01), Foy et al.

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